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Engineering Materials
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Engineering Materials Practice Set-8

May 16, 2021

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Page 1 of 4

1. Argentite is the principal ore or raw material for

Zinc

Tin

Silver

Aluminium

2. Weld decay is the phenomenon found with

Nonferrous materials

Cast iron

Stainless steel

Mild steel

3. Delta metal is an alloy of

Iron, nickel and copper

Iron, lead and tin

Copper, zinc and iron

Iron, aluminium and magnesium

4. The hardness of steel increases if it contains

Martensite

Cementite

Pearlite

Austenite

5. Tungsten in high speed steel provides

Sharp cutting edge

Hot hardness

Toughness

Wear resistance

6. Corrosion resistance of steel is increased by adding

Chromium and nickel

Aluminium and zinc

Nickel and molybdenum

Tungsten and sulphur

7. Melting point of iron is

1712°C

1489°C

1539°C

1601°C

8. Bronze contains

70% copper and 30% zinc

70 - 75% copper and rest tin

90% copper and 10% tin

85 - 92% copper and rest tin with little lead and nickel

9. Chromium in steel

Improves wear resistance, cutting ability and toughness

Improves cutting ability and reduces hardenability

Refines grain size and produces less tendency to carburisation, improves corrosion and heat resistant properties

Gives ductility, toughness, tensile strength and anti-corrosion properties

10. Which of the following is used for bearing liner?

Bell metal

Gun metal

Bronze

Babbitt metal

Page 2 of 4

11. Cold rolled steel sheets contain carbon of the following order

0.6%

0.1%

0.4%

0.2%

12. Connecting rod is usually made of

Medium carbon steel

Aluminium

High carbon steel

Low carbon steel

13. The presence of sulphur in pig iron makes

The casting unsound

It easily machinable

It brittle

It hard

14. Hardness of upper bainite (acicular structure) is about

RC 80

RC 57

RC 65

RC 48

15. The alloying element which reduces the formation of iron sulphide in steel is

Nickel

Chromium

Vanadium

Manganese

16. Free cutting steels

Contain carbon in free form

Require least cutting force

Do not exist

Are used where ease in machining is the criterion

17. Steel made from phosphate iron is

Brittle

Hard

Ductile

Tough

18. Carbon in iron is an example of

Substitutional solution

Intermetallic compounds

All of the above

Interstitial solid solution

19. High carbon steel carries carbon percentage

0.6 to 0.8%

0.1 to 0.3%

0.8 to 1.5%

0.3 to 0.6%

20. Drop forging dies contain carbon of the order of

0.7 to 0.9%

0.6 to 0.7%

0.25 to 0.5%

0.1 to 0.2%

Page 3 of 4

21. Which of the following is the binding material in cemented carbides?

Nickel

Vanadium

Iron

Cobalt

22. An example of amorphous material is

Zinc

Glass

Lead

Silver

23. The crystal structure of brass is

F.C.C.

H.C.P.

Orthorhombic crystalline structure

B.C.C.

24. Preheating is essential in welding

High speed steel

All of the above

All nonferrous materials

Cast iron

25. Perminvar alloy having constant permeability is an alloy of

Nickel, copper and zinc

Copper, nickel and antimony

Iron, zinc and bismuth

Nickel, copper and iron

26. Shock resisting steels should have

Low tensile strength

Low hardness

Low wear resistance

Toughness

27. Manganese in steel increases its

Fluidity

Hardness

Tensile strength

Ductility

28. Which is false statement about tempering? Tempering is done to

Release stresses

Improve toughness

Improve ductility

Improve machinability

29. The machinability of steel is increased by

Phosphorous, lead and sulphur

Silicon and sulphur

Phosphorous and aluminium

Sulphur, graphite and aluminium

30. Gun metal contains

70 - 78% copper and rest tin

90% copper and 10% tin

70% copper and 30% zinc

85 - 92% copper and rest tin with little lead and nickel

Page 4 of 4

31. The alloy used for making electrical resistances and heating elements is

Invar

Nichrome

Magnin

Elinvar

32. The hardness is the property of a material due to which it

Can cut another metal

Breaks with little permanent distortion

Can be rolled or hammered into thin sheets

Can be drawn into wires

33. Cupola produces following material

Pig iron

Cast iron

Malleable iron

Wrought iron

34. Aluminium bronze contains aluminium and copper in the ratio of

60 : 40

50 : 50

10 : 90

40 : 60

35. Permalloy is a

None ferrous alloy

Polymer

Kind of stainless steel

Nickel and iron alloy having high permeability

36. Compressive strength of grey cast iron in tonnes/cm is of the order of

57

35

1015

710

37. Nimonic contains __________ percentage of nickel as that of Inconel.

Same

Less

None of these

More

38. Sulphur in cast iron

Make the iron white and hard

Aids fusibility and fluidity

Makes the iron soft and easily machinable

Increases hardness and brittleness

39. Beryllium bronze has

(A) High yield point

(C) Both (A) and (B)

(B) High fatigue limit

(D) None of these

40. Phosphor bronze contains

0.5% of phosphorous

None of the above

1% phosphorous

2.5% phosphorous

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A Demrot is the founder of VideRime Online Learning, a leading engineering website. He did his BE Civil and M.Tech Structure from RGPV University, Bhopal and has been working as an Assistant Professor in a reputed college.

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